We divide 615321 by 13
The aim is to understand the frequency of 13 in 615321.

Moving on to step 1:
When dividing 6 by 13, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (1) from the dividend after 6, then repeat: 61 / 13

Step 2:
When dividing 61 by 13, we get 4 with a remainder of 9.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 52 from 61 and we're left with 9.
Bring next digit (5) of the dividend behind the 9 and repeat the process: 95 / 13

Step 3:
13 goes into 95 7 times with a remainder of 4.
The next digit of our result is 7. 
Result so far: 47.0
If we take 91 away from 95, we end up with 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 13

Step 4:
The number 13 fits into 43 3 times, leaving a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 473.0
If we subtract 39 from 43, we get 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 13

On to step 5:
If we divide 42 by 13, we get 3 and a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 4733.0
Deduct 39 from 42 and we're left with 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 13

On to step 6:
When dividing 31 by 13, we get 2 with a remainder of 5.
Put 2 as the next digit of the answer. 
Result so far: 47332.0
The remainder is 5 after subtracting 26 from 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 7:
If we divide 50 by 13, we get 3 and a remainder of 11.
Record the quotient 3 as the next digit in the result. 
Result so far: 47332.3
Subtract 39 from 50 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 8:
110 divided by 13 is 8 with a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 47332.38
The remainder is 6 after subtracting 104 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 9:
When dividing 60 by 13, we get 4 with a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 47332.384
Deduct 52 from 60 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 10:
13 goes into 80 6 times with a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 47332.3846
Subtracting 78 from 80 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 11:
20 divided by 13 is 1 with a remainder of 7.
The next digit of our result is 1. 
Result so far: 47332.38461
The remainder is 7 after subtracting 13 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 12:
13 goes into 70 5 times with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 47332.384615
Subtract 65 from 70 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 13:
If we divide 50 by 13, we get 3 and a remainder of 11.
Use 3 as the next digit of our solution. 
Result so far: 47332.3846153
Deduct 39 from 50 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 14:
110 divided by 13 is 8 with a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 47332.38461538
The remainder is 6 after subtracting 104 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Our division results in 47332.38461538 with a remaining 6e-09.